- U-Haul Truck Rental, Houston - U-Haul Moving
- U-Haul Trucks, Houston - Uhaul Truck Rental
- U.S. Postal Service, Houston
- Ultrasonic Equipment & Supplies, Houston
- Ultrasound Services, Houston
- Undergarments & Nightwear Manufacturers, Houston
- Underground Utility Locating Service, Houston
- Underground Wire & Cable Contractors, Houston
- Unfurnished Apartments, Houston
- Uniforms, Houston
- Uniforms Nurses & Scrubs, Houston
- Uniforms Renting & Cleaning Service, Houston
- Uniforms, Work Clothes & Safety Clothing, Houston
- Uninterruptible Power Supplies Systems, Houston
- Union Church, Houston
- Unitarian Universalist Churches, Houston
- United Church, Houston
- United States Coast Guard, Houston
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- Unity Church, Houston
- Universal Church, Houston
- Universal Joints, Houston
- Unsupported Plastic Film & Sheet Manufacturers, Houston
- Upholstery Fabric Stores , Houston
- Upholstery Fabrics Manufacturers, Houston
- Urologists, Houston - Urology Doctors, Physicians & Surgeons
- Used Appliances, Houston
- Used Book Stores, Houston - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Houston
- Used Furniture Stores, Houston - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Houston
- Utilities, Houston
- Utilities Contractors, Houston
- Utility & Waste Management Services, Houston
- Utility Installation Contractors, Houston
- Utility Services - Combined, Houston
- Utility Trailer Rental, Houston
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